2 * OSPF Flooding -- RFC2328 Section 13.
3 * Copyright (C) 1999, 2000 Toshiaki Takada
5 * This file is part of GNU Zebra.
7 * GNU Zebra is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published
9 * by the Free Software Foundation; either version 2, or (at your
10 * option) any later version.
12 * GNU Zebra is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License along
18 * with this program; see the file COPYING; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
35 #include "ospfd/ospfd.h"
36 #include "ospfd/ospf_interface.h"
37 #include "ospfd/ospf_ism.h"
38 #include "ospfd/ospf_asbr.h"
39 #include "ospfd/ospf_lsa.h"
40 #include "ospfd/ospf_lsdb.h"
41 #include "ospfd/ospf_neighbor.h"
42 #include "ospfd/ospf_nsm.h"
43 #include "ospfd/ospf_spf.h"
44 #include "ospfd/ospf_flood.h"
45 #include "ospfd/ospf_packet.h"
46 #include "ospfd/ospf_abr.h"
47 #include "ospfd/ospf_route.h"
48 #include "ospfd/ospf_zebra.h"
49 #include "ospfd/ospf_dump.h"
51 extern struct zclient
*zclient
;
53 /* Do the LSA acking specified in table 19, Section 13.5, row 2
54 * This get called from ospf_flood_out_interface. Declared inline
56 static void ospf_flood_delayed_lsa_ack(struct ospf_neighbor
*inbr
,
59 /* LSA is more recent than database copy, but was not
60 flooded back out receiving interface. Delayed
61 acknowledgment sent. If interface is in Backup state
62 delayed acknowledgment sent only if advertisement
63 received from Designated Router, otherwise do nothing See
64 RFC 2328 Section 13.5 */
66 /* Whether LSA is more recent or not, and whether this is in
67 response to the LSA being sent out recieving interface has been
68 worked out previously */
70 /* Deal with router as BDR */
71 if (inbr
->oi
->state
== ISM_Backup
&& !NBR_IS_DR(inbr
))
74 /* Schedule a delayed LSA Ack to be sent */
75 listnode_add(inbr
->oi
->ls_ack
,
76 ospf_lsa_lock(lsa
)); /* delayed LSA Ack */
79 /* Check LSA is related to external info. */
80 struct external_info
*ospf_external_info_check(struct ospf
*ospf
,
83 struct as_external_lsa
*al
;
85 struct route_node
*rn
;
86 struct list
*ext_list
;
87 struct listnode
*node
;
88 struct ospf_external
*ext
;
91 al
= (struct as_external_lsa
*)lsa
->data
;
94 p
.prefix
= lsa
->data
->id
;
95 p
.prefixlen
= ip_masklen(al
->mask
);
97 for (type
= 0; type
< ZEBRA_ROUTE_MAX
; type
++) {
101 is_prefix_default(&p
)
103 zclient
->default_information
[AFI_IP
],
105 : (zclient
->mi_redist
[AFI_IP
][type
].enabled
107 zclient
->redist
[AFI_IP
][type
],
109 // Pending: check for MI above.
111 ext_list
= ospf
->external
[type
];
115 for (ALL_LIST_ELEMENTS_RO(ext_list
, node
, ext
)) {
117 if (ext
->external_info
)
118 rn
= route_node_lookup(
120 (struct prefix
*)&p
);
122 route_unlock_node(rn
);
123 if (rn
->info
!= NULL
)
124 return (struct external_info
*)
131 if (is_prefix_default(&p
) && ospf
->external
[DEFAULT_ROUTE
]) {
132 ext_list
= ospf
->external
[DEFAULT_ROUTE
];
134 for (ALL_LIST_ELEMENTS_RO(ext_list
, node
, ext
)) {
135 if (!ext
->external_info
)
138 rn
= route_node_lookup(ext
->external_info
,
139 (struct prefix
*)&p
);
142 route_unlock_node(rn
);
143 if (rn
->info
!= NULL
)
144 return (struct external_info
*)rn
->info
;
150 static void ospf_process_self_originated_lsa(struct ospf
*ospf
,
151 struct ospf_lsa
*new,
152 struct ospf_area
*area
)
154 struct ospf_interface
*oi
;
155 struct external_info
*ei
;
156 struct listnode
*node
;
158 if (IS_DEBUG_OSPF_EVENT
)
160 "LSA[Type%d:%s]: Process self-originated LSA seq 0x%x",
161 new->data
->type
, inet_ntoa(new->data
->id
),
162 ntohl(new->data
->ls_seqnum
));
164 /* If we're here, we installed a self-originated LSA that we received
165 from a neighbor, i.e. it's more recent. We must see whether we want
167 If yes, we should use this LSA's sequence number and reoriginate
169 if not --- we must flush this LSA from the domain. */
170 switch (new->data
->type
) {
171 case OSPF_ROUTER_LSA
:
172 /* Originate a new instance and schedule flooding */
173 if (area
->router_lsa_self
)
174 area
->router_lsa_self
->data
->ls_seqnum
=
175 new->data
->ls_seqnum
;
176 ospf_router_lsa_update_area(area
);
178 case OSPF_NETWORK_LSA
:
179 case OSPF_OPAQUE_LINK_LSA
:
180 /* We must find the interface the LSA could belong to.
181 If the interface is no more a broadcast type or we are no
183 the DR, we flush the LSA otherwise -- create the new instance
185 schedule flooding. */
187 /* Look through all interfaces, not just area, since interface
188 could be moved from one area to another. */
189 for (ALL_LIST_ELEMENTS_RO(ospf
->oiflist
, node
, oi
))
190 /* These are sanity check. */
191 if (IPV4_ADDR_SAME(&oi
->address
->u
.prefix4
,
194 || oi
->type
!= OSPF_IFTYPE_BROADCAST
195 || !IPV4_ADDR_SAME(&oi
->address
->u
.prefix4
,
197 ospf_schedule_lsa_flush_area(area
, new);
201 if (new->data
->type
== OSPF_OPAQUE_LINK_LSA
) {
202 ospf_opaque_lsa_refresh(new);
206 if (oi
->network_lsa_self
)
207 oi
->network_lsa_self
->data
->ls_seqnum
=
208 new->data
->ls_seqnum
;
209 /* Schedule network-LSA origination. */
210 ospf_network_lsa_update(oi
);
214 case OSPF_SUMMARY_LSA
:
215 case OSPF_ASBR_SUMMARY_LSA
:
216 ospf_schedule_abr_task(ospf
);
218 case OSPF_AS_EXTERNAL_LSA
:
219 case OSPF_AS_NSSA_LSA
:
220 if ((new->data
->type
== OSPF_AS_EXTERNAL_LSA
)
221 && CHECK_FLAG(new->flags
, OSPF_LSA_LOCAL_XLT
)) {
222 ospf_translated_nssa_refresh(ospf
, NULL
, new);
225 ei
= ospf_external_info_check(ospf
, new);
227 ospf_external_lsa_refresh(ospf
, new, ei
,
230 ospf_lsa_flush_as(ospf
, new);
232 case OSPF_OPAQUE_AREA_LSA
:
233 ospf_opaque_lsa_refresh(new);
235 case OSPF_OPAQUE_AS_LSA
:
236 ospf_opaque_lsa_refresh(new);
237 /* Reconsideration may needed. */ /* XXX */
244 /* OSPF LSA flooding -- RFC2328 Section 13.(5). */
246 /* Now Updated for NSSA operation, as follows:
249 Type-5's have no change. Blocked to STUB or NSSA.
251 Type-7's can be received, and if a DR
252 they will also flood the local NSSA Area as Type-7's
254 If a Self-Originated LSA (now an ASBR),
255 The LSDB will be updated as Type-5's, (for continual re-fresh)
257 If an NSSA-IR it is installed/flooded as Type-7, P-bit on.
258 if an NSSA-ABR it is installed/flooded as Type-7, P-bit off.
260 Later, during the ABR TASK, if the ABR is the Elected NSSA
261 translator, then All Type-7s (with P-bit ON) are Translated to
262 Type-5's and flooded to all non-NSSA/STUB areas.
264 During ASE Calculations,
265 non-ABRs calculate external routes from Type-7's
266 ABRs calculate external routes from Type-5's and non-self Type-7s
268 int ospf_flood(struct ospf
*ospf
, struct ospf_neighbor
*nbr
,
269 struct ospf_lsa
*current
, struct ospf_lsa
*new)
271 struct ospf_interface
*oi
;
274 /* Type-7 LSA's will be flooded throughout their native NSSA area,
275 but will also be flooded as Type-5's into ABR capable links. */
277 if (IS_DEBUG_OSPF_EVENT
)
279 "LSA[Flooding]: start, NBR %s (%s), cur(%p), New-LSA[%s]",
280 inet_ntoa(nbr
->router_id
),
281 lookup_msg(ospf_nsm_state_msg
, nbr
->state
, NULL
),
282 (void *)current
, dump_lsa_key(new));
286 /* If there is already a database copy, and if the
287 database copy was received via flooding and installed less
288 than MinLSArrival seconds ago, discard the new LSA
289 (without acknowledging it). */
290 if (current
!= NULL
) /* -- endo. */
292 if (IS_LSA_SELF(current
)
293 && (ntohs(current
->data
->ls_age
) == 0
294 && ntohl(current
->data
->ls_seqnum
)
295 == OSPF_INITIAL_SEQUENCE_NUMBER
)) {
296 if (IS_DEBUG_OSPF_EVENT
)
298 "LSA[Flooding]: Got a self-originated LSA, "
299 "while local one is initial instance.");
300 ; /* Accept this LSA for quick LSDB resynchronization.
302 } else if (monotime_since(¤t
->tv_recv
, NULL
)
303 < ospf
->min_ls_arrival
* 1000LL) {
304 if (IS_DEBUG_OSPF_EVENT
)
306 "LSA[Flooding]: LSA is received recently.");
311 /* Flood the new LSA out some subset of the router's interfaces.
312 In some cases (e.g., the state of the receiving interface is
313 DR and the LSA was received from a router other than the
314 Backup DR) the LSA will be flooded back out the receiving
316 lsa_ack_flag
= ospf_flood_through(ospf
, nbr
, new);
318 /* Remove the current database copy from all neighbors' Link state
319 retransmission lists. AS_EXTERNAL and AS_EXTERNAL_OPAQUE does
320 ^^^^^^^^^^^^^^^^^^^^^^^
322 All other (even NSSA's) do have area ID. */
324 switch (current
->data
->type
) {
325 case OSPF_AS_EXTERNAL_LSA
:
326 case OSPF_OPAQUE_AS_LSA
:
327 ospf_ls_retransmit_delete_nbr_as(ospf
, current
);
330 ospf_ls_retransmit_delete_nbr_area(nbr
->oi
->area
,
336 /* Do some internal house keeping that is needed here */
337 SET_FLAG(new->flags
, OSPF_LSA_RECEIVED
);
338 (void)ospf_lsa_is_self_originated(ospf
, new); /* Let it set the flag */
340 /* Install the new LSA in the link state database
341 (replacing the current database copy). This may cause the
342 routing table calculation to be scheduled. In addition,
343 timestamp the new LSA with the current time. The flooding
344 procedure cannot overwrite the newly installed LSA until
345 MinLSArrival seconds have elapsed. */
347 if (!(new = ospf_lsa_install(ospf
, nbr
->oi
, new)))
348 return -1; /* unknown LSA type or any other error condition */
350 /* Acknowledge the receipt of the LSA by sending a Link State
351 Acknowledgment packet back out the receiving interface. */
353 ospf_flood_delayed_lsa_ack(nbr
, new);
355 /* If this new LSA indicates that it was originated by the
356 receiving router itself, the router must take special action,
357 either updating the LSA or in some cases flushing it from
358 the routing domain. */
359 if (ospf_lsa_is_self_originated(ospf
, new))
360 ospf_process_self_originated_lsa(ospf
, new, oi
->area
);
362 /* Update statistics value for OSPF-MIB. */
363 ospf
->rx_lsa_count
++;
368 /* OSPF LSA flooding -- RFC2328 Section 13.3. */
369 static int ospf_flood_through_interface(struct ospf_interface
*oi
,
370 struct ospf_neighbor
*inbr
,
371 struct ospf_lsa
*lsa
)
373 struct ospf_neighbor
*onbr
;
374 struct route_node
*rn
;
377 if (IS_DEBUG_OSPF_EVENT
)
379 "ospf_flood_through_interface(): "
380 "considering int %s, INBR(%s), LSA[%s] AGE %u",
381 IF_NAME(oi
), inbr
? inet_ntoa(inbr
->router_id
) : "NULL",
382 dump_lsa_key(lsa
), ntohs(lsa
->data
->ls_age
));
384 if (!ospf_if_is_enable(oi
))
387 /* Remember if new LSA is aded to a retransmit list. */
390 /* Each of the neighbors attached to this interface are examined,
391 to determine whether they must receive the new LSA. The following
392 steps are executed for each neighbor: */
393 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
)) {
394 struct ospf_lsa
*ls_req
;
396 if (rn
->info
== NULL
)
400 if (IS_DEBUG_OSPF_EVENT
)
402 "ospf_flood_through_interface(): considering nbr %s (%s)",
403 inet_ntoa(onbr
->router_id
),
404 lookup_msg(ospf_nsm_state_msg
, onbr
->state
,
407 /* If the neighbor is in a lesser state than Exchange, it
408 does not participate in flooding, and the next neighbor
409 should be examined. */
410 if (onbr
->state
< NSM_Exchange
)
413 /* If the adjacency is not yet full (neighbor state is
414 Exchange or Loading), examine the Link state request
415 list associated with this adjacency. If there is an
416 instance of the new LSA on the list, it indicates that
417 the neighboring router has an instance of the LSA
418 already. Compare the new LSA to the neighbor's copy: */
419 if (onbr
->state
< NSM_Full
) {
420 if (IS_DEBUG_OSPF_EVENT
)
422 "ospf_flood_through_interface(): nbr adj is not Full");
423 ls_req
= ospf_ls_request_lookup(onbr
, lsa
);
424 if (ls_req
!= NULL
) {
427 ret
= ospf_lsa_more_recent(ls_req
, lsa
);
428 /* The new LSA is less recent. */
431 /* The two copies are the same instance, then
433 the LSA from the Link state request list. */
435 ospf_ls_request_delete(onbr
, ls_req
);
436 ospf_check_nbr_loading(onbr
);
439 /* The new LSA is more recent. Delete the LSA
440 from the Link state request list. */
442 ospf_ls_request_delete(onbr
, ls_req
);
443 ospf_check_nbr_loading(onbr
);
448 if (IS_OPAQUE_LSA(lsa
->data
->type
)) {
449 if (!CHECK_FLAG(onbr
->options
, OSPF_OPTION_O
)) {
450 if (IS_DEBUG_OSPF(lsa
, LSA_FLOODING
))
452 "Skip this neighbor: Not Opaque-capable.");
457 /* If the new LSA was received from this neighbor,
458 examine the next neighbor. */
459 #ifdef ORIGINAL_CODING
461 if (IPV4_ADDR_SAME(&inbr
->router_id
, &onbr
->router_id
))
463 #else /* ORIGINAL_CODING */
466 * Triggered by LSUpd message parser "ospf_ls_upd ()".
467 * E.g., all LSAs handling here is received via network.
469 if (IPV4_ADDR_SAME(&inbr
->router_id
,
471 if (IS_DEBUG_OSPF(lsa
, LSA_FLOODING
))
473 "Skip this neighbor: inbr == onbr");
478 * Triggered by MaxAge remover, so far.
479 * NULL "inbr" means flooding starts from this node.
481 if (IPV4_ADDR_SAME(&lsa
->data
->adv_router
,
483 if (IS_DEBUG_OSPF(lsa
, LSA_FLOODING
))
485 "Skip this neighbor: lsah->adv_router == onbr");
489 #endif /* ORIGINAL_CODING */
491 /* Add the new LSA to the Link state retransmission list
492 for the adjacency. The LSA will be retransmitted
493 at intervals until an acknowledgment is seen from
495 ospf_ls_retransmit_add(onbr
, lsa
);
499 /* If in the previous step, the LSA was NOT added to any of
500 the Link state retransmission lists, there is no need to
501 flood the LSA out the interface. */
502 if (retx_flag
== 0) {
503 return (inbr
&& inbr
->oi
== oi
);
506 /* if we've received the lsa on this interface we need to perform
507 additional checking */
508 if (inbr
&& (inbr
->oi
== oi
)) {
509 /* If the new LSA was received on this interface, and it was
510 received from either the Designated Router or the Backup
511 Designated Router, chances are that all the neighbors have
512 received the LSA already. */
513 if (NBR_IS_DR(inbr
) || NBR_IS_BDR(inbr
)) {
514 if (IS_DEBUG_OSPF_NSSA
)
516 "ospf_flood_through_interface(): "
517 "DR/BDR NOT SEND to int %s",
522 /* If the new LSA was received on this interface, and the
523 interface state is Backup, examine the next interface. The
524 Designated Router will do the flooding on this interface.
525 However, if the Designated Router fails the router will
526 end up retransmitting the updates. */
528 if (oi
->state
== ISM_Backup
) {
529 if (IS_DEBUG_OSPF_NSSA
)
531 "ospf_flood_through_interface(): "
532 "ISM_Backup NOT SEND to int %s",
538 /* The LSA must be flooded out the interface. Send a Link State
539 Update packet (including the new LSA as contents) out the
540 interface. The LSA's LS age must be incremented by InfTransDelay
541 (which must be > 0) when it is copied into the outgoing Link
542 State Update packet (until the LS age field reaches the maximum
544 /* XXX HASSO: Is this IS_DEBUG_OSPF_NSSA really correct? */
545 if (IS_DEBUG_OSPF_NSSA
)
547 "ospf_flood_through_interface(): "
548 "DR/BDR sending upd to int %s",
551 /* RFC2328 Section 13.3
552 On non-broadcast networks, separate Link State Update
553 packets must be sent, as unicasts, to each adjacent neighbor
554 (i.e., those in state Exchange or greater). The destination
555 IP addresses for these packets are the neighbors' IP
557 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
558 struct ospf_neighbor
*nbr
;
560 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
561 if ((nbr
= rn
->info
) != NULL
)
562 if (nbr
!= oi
->nbr_self
563 && nbr
->state
>= NSM_Exchange
)
564 ospf_ls_upd_send_lsa(
566 OSPF_SEND_PACKET_DIRECT
);
568 ospf_ls_upd_send_lsa(oi
->nbr_self
, lsa
,
569 OSPF_SEND_PACKET_INDIRECT
);
574 int ospf_flood_through_area(struct ospf_area
*area
, struct ospf_neighbor
*inbr
,
575 struct ospf_lsa
*lsa
)
577 struct listnode
*node
, *nnode
;
578 struct ospf_interface
*oi
;
579 int lsa_ack_flag
= 0;
582 /* All other types are specific to a single area (Area A). The
583 eligible interfaces are all those interfaces attaching to the
584 Area A. If Area A is the backbone, this includes all the virtual
586 for (ALL_LIST_ELEMENTS(area
->oiflist
, node
, nnode
, oi
)) {
587 if (area
->area_id
.s_addr
!= OSPF_AREA_BACKBONE
588 && oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
591 if ((lsa
->data
->type
== OSPF_OPAQUE_LINK_LSA
)
592 && (lsa
->oi
!= oi
)) {
594 * Link local scoped Opaque-LSA should only be flooded
595 * for the link on which the LSA has received.
597 if (IS_DEBUG_OSPF(lsa
, LSA_FLOODING
))
599 "Type-9 Opaque-LSA: lsa->oi(%p) != oi(%p)",
600 (void *)lsa
->oi
, (void *)oi
);
604 if (ospf_flood_through_interface(oi
, inbr
, lsa
))
608 return (lsa_ack_flag
);
611 int ospf_flood_through_as(struct ospf
*ospf
, struct ospf_neighbor
*inbr
,
612 struct ospf_lsa
*lsa
)
614 struct listnode
*node
;
615 struct ospf_area
*area
;
620 /* The incoming LSA is type 5 or type 7 (AS-EXTERNAL or AS-NSSA )
622 Divert the Type-5 LSA's to all non-NSSA/STUB areas
624 Divert the Type-7 LSA's to all NSSA areas
626 AS-external-LSAs are flooded throughout the entire AS, with the
627 exception of stub areas (see Section 3.6). The eligible
628 interfaces are all the router's interfaces, excluding virtual
629 links and those interfaces attaching to stub areas. */
631 if (CHECK_FLAG(lsa
->flags
, OSPF_LSA_LOCAL_XLT
)) /* Translated from 7 */
632 if (IS_DEBUG_OSPF_NSSA
)
633 zlog_debug("Flood/AS: NSSA TRANSLATED LSA");
635 for (ALL_LIST_ELEMENTS_RO(ospf
->areas
, node
, area
)) {
636 int continue_flag
= 0;
637 struct listnode
*if_node
;
638 struct ospf_interface
*oi
;
640 switch (area
->external_routing
) {
641 /* Don't send AS externals into stub areas. Various types
642 of support for partial stub areas can be implemented
643 here. NSSA's will receive Type-7's that have areas
644 matching the originl LSA. */
645 case OSPF_AREA_NSSA
: /* Sending Type 5 or 7 into NSSA area */
646 /* Type-7, flood NSSA area */
647 if (lsa
->data
->type
== OSPF_AS_NSSA_LSA
648 && area
== lsa
->area
)
649 /* We will send it. */
652 continue_flag
= 1; /* Skip this NSSA area for
656 case OSPF_AREA_TYPE_MAX
:
658 continue_flag
= 1; /* Skip this area. */
661 case OSPF_AREA_DEFAULT
:
663 /* No Type-7 into normal area */
664 if (lsa
->data
->type
== OSPF_AS_NSSA_LSA
)
665 continue_flag
= 1; /* skip Type-7 */
667 continue_flag
= 0; /* Do this area. */
671 /* Do continue for above switch. Saves a big if then mess */
673 continue; /* main for-loop */
675 /* send to every interface in this area */
677 for (ALL_LIST_ELEMENTS_RO(area
->oiflist
, if_node
, oi
)) {
678 /* Skip virtual links */
679 if (oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
)
680 if (ospf_flood_through_interface(oi
, inbr
,
684 } /* main area for-loop */
686 return (lsa_ack_flag
);
689 int ospf_flood_through(struct ospf
*ospf
, struct ospf_neighbor
*inbr
,
690 struct ospf_lsa
*lsa
)
692 int lsa_ack_flag
= 0;
694 /* Type-7 LSA's for NSSA are flooded throughout the AS here, and
695 upon return are updated in the LSDB for Type-7's. Later,
696 re-fresh will re-send them (and also, if ABR, packet code will
697 translate to Type-5's)
699 As usual, Type-5 LSA's (if not DISCARDED because we are STUB or
700 NSSA) are flooded throughout the AS, and are updated in the
702 #ifdef ORIGINAL_CODING
703 switch (lsa
->data
->type
) {
704 case OSPF_ROUTER_LSA
:
705 case OSPF_NETWORK_LSA
:
706 case OSPF_SUMMARY_LSA
:
707 case OSPF_ASBR_SUMMARY_LSA
:
708 case OSPF_OPAQUE_LINK_LSA
: /* ospf_flood_through_interface ? */
709 case OSPF_OPAQUE_AREA_LSA
:
711 ospf_flood_through_area(inbr
->oi
->area
, inbr
, lsa
);
713 case OSPF_AS_EXTERNAL_LSA
: /* Type-5 */
714 case OSPF_OPAQUE_AS_LSA
:
715 lsa_ack_flag
= ospf_flood_through_as(ospf
, inbr
, lsa
);
717 /* Type-7 Only received within NSSA, then flooded */
718 case OSPF_AS_NSSA_LSA
:
719 /* Any P-bit was installed with the Type-7. */
721 ospf_flood_through_area(inbr
->oi
->area
, inbr
, lsa
);
723 if (IS_DEBUG_OSPF_NSSA
)
725 "ospf_flood_through: LOCAL NSSA FLOOD of Type-7.");
730 #else /* ORIGINAL_CODING */
732 * At the common sub-sub-function "ospf_flood_through_interface()",
733 * a parameter "inbr" will be used to distinguish the called context
734 * whether the given LSA was received from the neighbor, or the
735 * flooding for the LSA starts from this node (e.g. the LSA was self-
736 * originated, or the LSA is going to be flushed from routing domain).
738 * So, for consistency reasons, this function "ospf_flood_through()"
739 * should also allow the usage that the given "inbr" parameter to be
740 * NULL. If we do so, corresponding AREA parameter should be referred
741 * by "lsa->area", instead of "inbr->oi->area".
743 switch (lsa
->data
->type
) {
744 case OSPF_AS_EXTERNAL_LSA
: /* Type-5 */
745 case OSPF_OPAQUE_AS_LSA
:
746 lsa_ack_flag
= ospf_flood_through_as(ospf
, inbr
, lsa
);
748 /* Type-7 Only received within NSSA, then flooded */
749 case OSPF_AS_NSSA_LSA
:
750 /* Any P-bit was installed with the Type-7. */
752 if (IS_DEBUG_OSPF_NSSA
)
754 "ospf_flood_through: LOCAL NSSA FLOOD of Type-7.");
757 lsa_ack_flag
= ospf_flood_through_area(lsa
->area
, inbr
, lsa
);
760 #endif /* ORIGINAL_CODING */
762 return (lsa_ack_flag
);
766 /* Management functions for neighbor's Link State Request list. */
767 void ospf_ls_request_add(struct ospf_neighbor
*nbr
, struct ospf_lsa
*lsa
)
770 * We cannot make use of the newly introduced callback function
771 * "lsdb->new_lsa_hook" to replace debug output below, just because
772 * it seems no simple and smart way to pass neighbor information to
773 * the common function "ospf_lsdb_add()" -- endo.
775 if (IS_DEBUG_OSPF(lsa
, LSA_FLOODING
))
776 zlog_debug("RqstL(%lu)++, NBR(%s), LSA[%s]",
777 ospf_ls_request_count(nbr
),
778 inet_ntoa(nbr
->router_id
), dump_lsa_key(lsa
));
780 ospf_lsdb_add(&nbr
->ls_req
, lsa
);
783 unsigned long ospf_ls_request_count(struct ospf_neighbor
*nbr
)
785 return ospf_lsdb_count_all(&nbr
->ls_req
);
788 int ospf_ls_request_isempty(struct ospf_neighbor
*nbr
)
790 return ospf_lsdb_isempty(&nbr
->ls_req
);
793 /* Remove LSA from neighbor's ls-request list. */
794 void ospf_ls_request_delete(struct ospf_neighbor
*nbr
, struct ospf_lsa
*lsa
)
796 if (nbr
->ls_req_last
== lsa
) {
797 ospf_lsa_unlock(&nbr
->ls_req_last
);
798 nbr
->ls_req_last
= NULL
;
801 if (IS_DEBUG_OSPF(lsa
, LSA_FLOODING
)) /* -- endo. */
802 zlog_debug("RqstL(%lu)--, NBR(%s), LSA[%s]",
803 ospf_ls_request_count(nbr
),
804 inet_ntoa(nbr
->router_id
), dump_lsa_key(lsa
));
806 ospf_lsdb_delete(&nbr
->ls_req
, lsa
);
809 /* Remove all LSA from neighbor's ls-requenst list. */
810 void ospf_ls_request_delete_all(struct ospf_neighbor
*nbr
)
812 ospf_lsa_unlock(&nbr
->ls_req_last
);
813 nbr
->ls_req_last
= NULL
;
814 ospf_lsdb_delete_all(&nbr
->ls_req
);
817 /* Lookup LSA from neighbor's ls-request list. */
818 struct ospf_lsa
*ospf_ls_request_lookup(struct ospf_neighbor
*nbr
,
819 struct ospf_lsa
*lsa
)
821 return ospf_lsdb_lookup(&nbr
->ls_req
, lsa
);
824 struct ospf_lsa
*ospf_ls_request_new(struct lsa_header
*lsah
)
826 struct ospf_lsa
*new;
828 new = ospf_lsa_new_and_data(OSPF_LSA_HEADER_SIZE
);
829 memcpy(new->data
, lsah
, OSPF_LSA_HEADER_SIZE
);
835 /* Management functions for neighbor's ls-retransmit list. */
836 unsigned long ospf_ls_retransmit_count(struct ospf_neighbor
*nbr
)
838 return ospf_lsdb_count_all(&nbr
->ls_rxmt
);
841 unsigned long ospf_ls_retransmit_count_self(struct ospf_neighbor
*nbr
,
844 return ospf_lsdb_count_self(&nbr
->ls_rxmt
, lsa_type
);
847 int ospf_ls_retransmit_isempty(struct ospf_neighbor
*nbr
)
849 return ospf_lsdb_isempty(&nbr
->ls_rxmt
);
852 /* Add LSA to be retransmitted to neighbor's ls-retransmit list. */
853 void ospf_ls_retransmit_add(struct ospf_neighbor
*nbr
, struct ospf_lsa
*lsa
)
855 struct ospf_lsa
*old
;
857 old
= ospf_ls_retransmit_lookup(nbr
, lsa
);
859 if (ospf_lsa_more_recent(old
, lsa
) < 0) {
861 old
->retransmit_counter
--;
862 ospf_lsdb_delete(&nbr
->ls_rxmt
, old
);
864 lsa
->retransmit_counter
++;
866 * We cannot make use of the newly introduced callback function
867 * "lsdb->new_lsa_hook" to replace debug output below, just
869 * it seems no simple and smart way to pass neighbor information
871 * the common function "ospf_lsdb_add()" -- endo.
873 if (IS_DEBUG_OSPF(lsa
, LSA_FLOODING
))
874 zlog_debug("RXmtL(%lu)++, NBR(%s), LSA[%s]",
875 ospf_ls_retransmit_count(nbr
),
876 inet_ntoa(nbr
->router_id
),
878 ospf_lsdb_add(&nbr
->ls_rxmt
, lsa
);
882 /* Remove LSA from neibghbor's ls-retransmit list. */
883 void ospf_ls_retransmit_delete(struct ospf_neighbor
*nbr
, struct ospf_lsa
*lsa
)
885 if (ospf_ls_retransmit_lookup(nbr
, lsa
)) {
886 lsa
->retransmit_counter
--;
887 if (IS_DEBUG_OSPF(lsa
, LSA_FLOODING
)) /* -- endo. */
888 zlog_debug("RXmtL(%lu)--, NBR(%s), LSA[%s]",
889 ospf_ls_retransmit_count(nbr
),
890 inet_ntoa(nbr
->router_id
),
892 ospf_lsdb_delete(&nbr
->ls_rxmt
, lsa
);
896 /* Clear neighbor's ls-retransmit list. */
897 void ospf_ls_retransmit_clear(struct ospf_neighbor
*nbr
)
899 struct ospf_lsdb
*lsdb
;
902 lsdb
= &nbr
->ls_rxmt
;
904 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
905 struct route_table
*table
= lsdb
->type
[i
].db
;
906 struct route_node
*rn
;
907 struct ospf_lsa
*lsa
;
909 for (rn
= route_top(table
); rn
; rn
= route_next(rn
))
910 if ((lsa
= rn
->info
) != NULL
)
911 ospf_ls_retransmit_delete(nbr
, lsa
);
914 ospf_lsa_unlock(&nbr
->ls_req_last
);
915 nbr
->ls_req_last
= NULL
;
918 /* Lookup LSA from neighbor's ls-retransmit list. */
919 struct ospf_lsa
*ospf_ls_retransmit_lookup(struct ospf_neighbor
*nbr
,
920 struct ospf_lsa
*lsa
)
922 return ospf_lsdb_lookup(&nbr
->ls_rxmt
, lsa
);
925 static void ospf_ls_retransmit_delete_nbr_if(struct ospf_interface
*oi
,
926 struct ospf_lsa
*lsa
)
928 struct route_node
*rn
;
929 struct ospf_neighbor
*nbr
;
930 struct ospf_lsa
*lsr
;
932 if (ospf_if_is_enable(oi
))
933 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
934 /* If LSA find in LS-retransmit list, then remove it. */
935 if ((nbr
= rn
->info
) != NULL
) {
936 lsr
= ospf_ls_retransmit_lookup(nbr
, lsa
);
938 /* If LSA find in ls-retransmit list, remove it.
941 && lsr
->data
->ls_seqnum
942 == lsa
->data
->ls_seqnum
)
943 ospf_ls_retransmit_delete(nbr
, lsr
);
947 void ospf_ls_retransmit_delete_nbr_area(struct ospf_area
*area
,
948 struct ospf_lsa
*lsa
)
950 struct listnode
*node
, *nnode
;
951 struct ospf_interface
*oi
;
953 for (ALL_LIST_ELEMENTS(area
->oiflist
, node
, nnode
, oi
))
954 ospf_ls_retransmit_delete_nbr_if(oi
, lsa
);
957 void ospf_ls_retransmit_delete_nbr_as(struct ospf
*ospf
, struct ospf_lsa
*lsa
)
959 struct listnode
*node
, *nnode
;
960 struct ospf_interface
*oi
;
962 for (ALL_LIST_ELEMENTS(ospf
->oiflist
, node
, nnode
, oi
))
963 ospf_ls_retransmit_delete_nbr_if(oi
, lsa
);
967 /* Sets ls_age to MaxAge and floods throu the area.
968 When we implement ASE routing, there will be anothe function
969 flushing an LSA from the whole domain. */
970 void ospf_lsa_flush_area(struct ospf_lsa
*lsa
, struct ospf_area
*area
)
972 /* Reset the lsa origination time such that it gives
973 more time for the ACK to be received and avoid
975 lsa
->data
->ls_age
= htons(OSPF_LSA_MAXAGE
);
976 if (IS_DEBUG_OSPF_EVENT
)
977 zlog_debug("%s: MAXAGE set to LSA %s", __PRETTY_FUNCTION__
,
978 inet_ntoa(lsa
->data
->id
));
979 monotime(&lsa
->tv_recv
);
980 lsa
->tv_orig
= lsa
->tv_recv
;
981 ospf_flood_through_area(area
, NULL
, lsa
);
982 ospf_lsa_maxage(area
->ospf
, lsa
);
985 void ospf_lsa_flush_as(struct ospf
*ospf
, struct ospf_lsa
*lsa
)
987 /* Reset the lsa origination time such that it gives
988 more time for the ACK to be received and avoid
990 lsa
->data
->ls_age
= htons(OSPF_LSA_MAXAGE
);
991 monotime(&lsa
->tv_recv
);
992 lsa
->tv_orig
= lsa
->tv_recv
;
993 ospf_flood_through_as(ospf
, NULL
, lsa
);
994 ospf_lsa_maxage(ospf
, lsa
);
997 void ospf_lsa_flush(struct ospf
*ospf
, struct ospf_lsa
*lsa
)
999 lsa
->data
->ls_age
= htons(OSPF_LSA_MAXAGE
);
1001 switch (lsa
->data
->type
) {
1002 case OSPF_ROUTER_LSA
:
1003 case OSPF_NETWORK_LSA
:
1004 case OSPF_SUMMARY_LSA
:
1005 case OSPF_ASBR_SUMMARY_LSA
:
1006 case OSPF_AS_NSSA_LSA
:
1007 case OSPF_OPAQUE_LINK_LSA
:
1008 case OSPF_OPAQUE_AREA_LSA
:
1009 ospf_lsa_flush_area(lsa
, lsa
->area
);
1011 case OSPF_AS_EXTERNAL_LSA
:
1012 case OSPF_OPAQUE_AS_LSA
:
1013 ospf_lsa_flush_as(ospf
, lsa
);
1016 zlog_info("%s: Unknown LSA type %u", __func__
, lsa
->data
->type
);